package com.ygqh.baby.utils;

	import org.apache.commons.codec.binary.Base64;
	import org.bouncycastle.jce.provider.BouncyCastleProvider;

	import javax.crypto.BadPaddingException;
	import javax.crypto.Cipher;
	import javax.crypto.IllegalBlockSizeException;
	import javax.crypto.NoSuchPaddingException;
	import javax.crypto.spec.IvParameterSpec;
	import javax.crypto.spec.SecretKeySpec;
	import java.io.UnsupportedEncodingException;
	import java.security.*;
	import java.security.spec.InvalidParameterSpecException;

	/**
	 * Created by yfs on 2017/2/6.
	 * <p>
	 * AES-128-CBC 加密方式
	 * 注：
	 * AES-128-CBC可以自己定义“密钥”和“偏移量“。
	 * AES-128是jdk自动生成的“密钥”。
	 */
	public class AesCbcUtil {
		  public static boolean initialized = false;
		  
		   public static void initialize(){
		        if (initialized) return;
		        Security.addProvider(new BouncyCastleProvider());
		        initialized = true;
		    }
	  /*  static {
	        //BouncyCastle是一个开源的加解密解决方案，主页在http://www.bouncycastle.org/
	       if(initialized)return;
	    	Security.addProvider(new BouncyCastleProvider());
	    }*/

	    /**
	     * AES解密
	     *
	     * @param data           //密文，被加密的数据
	     * @param key            //秘钥
	     * @param iv             //偏移量
	     * @param encodingFormat //解密后的结果需要进行的编码
	     * @return
	     * @throws Exception
	     */
	    public static String decrypt(String data, String key, String iv, String encodingFormat) throws Exception {
            initialize();

	        //被加密的数据
	        byte[] dataByte = Base64.decodeBase64(data);
	        //加密秘钥
	        byte[] keyByte = Base64.decodeBase64(key);
	        //偏移量
	        byte[] ivByte = Base64.decodeBase64(iv);


	        try {
	            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");

	            SecretKeySpec spec = new SecretKeySpec(keyByte, "AES");

	            AlgorithmParameters parameters = AlgorithmParameters.getInstance("AES");
	            parameters.init(new IvParameterSpec(ivByte));

	            cipher.init(Cipher.DECRYPT_MODE, spec, parameters);// 初始化

	            byte[] resultByte = cipher.doFinal(dataByte);
	            if (null != resultByte && resultByte.length > 0) {
	                String result = new String(resultByte, encodingFormat);
	                return result;
	            }
	            return null;
	        } catch (NoSuchAlgorithmException e) {
	            e.printStackTrace();
	        } catch (NoSuchPaddingException e) {
	            e.printStackTrace();
	        } catch (InvalidParameterSpecException e) {
	            e.printStackTrace();
	        } catch (InvalidKeyException e) {
	            e.printStackTrace();
	        } catch (InvalidAlgorithmParameterException e) {
	            e.printStackTrace();
	        } catch (IllegalBlockSizeException e) {
	            e.printStackTrace();
	        } catch (BadPaddingException e) {
	            e.printStackTrace();
	        } catch (UnsupportedEncodingException e) {
	            e.printStackTrace();
	        }

	        return null;
	    }

}
